What I find a problem with shavings, is that the goats tend to nibble on it. And I don't think it is very good for them to eat. That might be my goats though that are weird. I prefer to give straw, and straw is a good bulk fibre feed as well- goats will eat it if it is nice straw.
I do put either stovies (compressed shavings) or shavings under the straw for the kids. While they are on milk, they wee a lot, so that helps to soak it up!
Beth